Category: Satellites

Satellites: Revisit time

Revisit to detect a change - How long do I have to wait for an image and often can I have an update? While a single image may contain a lot of information, many times we want to detect a change and hence we need...

Satelite Imagery: Chlorophyll and Spring

The below animation, created by ESA with data from SENTINEL-3, shows the changing Chlorophyll around the world between early April and late June 2017. Tropical Rainforests: These hardly change as they keep their high levels of Chlorophyll. USA: The arrival of spring can be clearly…

Satellites: Sun Synchronus Orbits

Sun-synchronous orbit (SSO) is a particular kind of polar orbit, see picture below. Satellites in SSO, travelling over the polar regions, are "synchronous" with the Sun. This means they are synchronised to always be in the same ‘fixed’ position relative to the Sun. This means...

Satellites: More than Just Pictures

Satellite data is much more than just pictures - optical imaging is only a fraction of the capability When thinking about satellites most people think of images, as on Google maps or the more traditional aerial photography. Indeed, satellites routinely produce these images – and...

Satellites: SENTINEL-4

SENTINEL-4 mission is part of ESA’s Copernicus program. SENTINEL-4 was launched in 2019 and is the heaviest of the Copernicus missions at 3,600 kg. Unlike SENTINEL-1 and SENTINEL-2 which orbit at around 700km, this orbits at nearly 36,000 KM in a geostationary orbit. S4, like…

Satellite: SENTINEL-3

SENTINEL-3 Overview SENTINEL-3, launched in 2016 as part of ESA’s Copernicus Program,  main objective is to measure the land and sea temperatures and colors, sea-surface topography, and provide climate monitoring. SENTINEL-3 currently has three mission, S-3A, S-3B, and S3C, but will be expanding to four…

Copernicus: SENTINEL 1 to 6

The European Space Agency, ESA, Copernicus programme has six missions, as of present: SENTINEL-1 Radar satellite, which provides the ability to see at night, through clouds, and provide millimetre accuracy on measuring elevation. SENTINEL-2 Optical satellite with multiple wavelength detectors, primarily for monitoring changes on...